Door-lock.



No. 809,610. PATENTBD JAN. 9, 1906. G. F. FRINGER.

DOOR LOCK.

APPLICATION FILED SEPT. 29, 1904.

Witness es Inventor.

UNITED STATES CHARLES F. FRINGER,

ATENT OFFICE.

OF LITHIA, VIRGINIA.

DOOR-LOCK.

Specification of Letters Patent.

Patented Jan. 9, 1906.

To all zuhmn it may concern.-

Be it known that I, CHARLES F. FRINGER, a citizen of the United States, residing at Lithia, in the county of Botetourt and State of Virginia, have invented a new and useful Door-Lock, of which the following is a speciiication.

This invention relates to door-locks, and has for its object to simplify and improve the construction and produce a device of this character which may be inexpensively manufactured and which will be operative only by the particular form of key adapted thereto.

lVith these and other objects in view,which will appear as the nature of the invention is better understood, the same consists in cer tain novel features of construction, as hereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, and in which corresponding parts are denoted by like designating characters, is illustrated the preferred form of the embodiment of the invention capable of carrying the same into practical operation, it being understood that the invention is not necessarily limited thereto, as various changes in the shape, proportions, and general assemblage of the parts may be resorted to without departing from the principle of the invention or sacrificing any of its advantages.

In the drawings thus employed, Figure 1 is a side elevation with the cover removed, with the locking-bolts and tumblers in projected position. Fig. 2 is a similar view with the bolt and tumblers withdrawn and the key in operative position. Fig. 3 is a section on the line 3 3 of Fig. 2 with the key removed.

The lock-casing 10, which may be of any desired shape and formed of metal or other suitable material, is provided with a detachable cover-plate 11. The interior of the casing is provided with a guideway 12 to receive the locking-bolt 13, the longitudinal movement of the latter being limited by a pin 14, carried by the casing and projecting in a blind slot 15 in the bolt. The casing 10 is also provided with a plurality of verticallydisposed spaced tumbler-guideways 16, in which corresponding tumblers 17 are slidably disposed.

The tumblers are each provided with a transverse recess 18 for registration with a transverse key-guideway 19 in the casin and the bolt 13 is likewise provided with transverse notches 20 to receive the lower ends of the tumblers when the bolt is in its projected position, as in Fig. 1, said tumblers being adapted to rest upon the lands 21 between the notches when the bolt is withdrawn, as in Fig. 2. The key-guideway is preferably formed of increasing width toward the inner end, and the key 22 is tapered toward the point and provided with a lat eral shoulder 23 for bearing against the easing at the inlet to the key-guideway. The key is also provided with lateral lugs 24 for engagement with the tumblers, said lugs preferably decreasing in size toward the free end of the key. By this arrangement when the bolt 13 is projected it Will be firmly supported in that position by the tumblers 17, as in Fig. 1. l/Vhen it is desired to release the bolt, the key is inserted as far as the shoulder 23 will permit and the outer end 25 of the key tilted toward the bolt, as in Fig. 2, with the effect of moving the point 26 in the opposite direction and causing the lugs 24 to simultaneously actuate the tumblers and throw them out of engagement with the bolt, thereby releasing the latter and permitting its Withdrawal.

Attention is called to the fact that the tumbler adjacent to the handle of the key is shorter than the others, thus allowing all the tumblers to simultaneously clear the lockingrecesses in the bolt, while the lower wall of the recess in said tumbler is inclined to correspond to the inclination of the key when the latter is tilted.

The security of the lock may be increased by varying the distances between the tumblers or the thicknesses of the same and forming the keys to correspond, so that a great va riety of locks and corresponding keys may be produced with no duplicates, thus materially increasing the value and efliciency of the invention.

Having thus described my invention, what is claimed is- In a lock, an inclosing casing having a transverse bolt-guide and provided with a plurality of tumbler-guides disposed at right angles thereto, a locking-b olt slidably mounted in the bolt-guide and provided with spaced recesses adapted to register with the tumbler-guides when the bolt is projected, said bolt being provided with an elongated slot and having one end thereof terminating in a handle, a tapering keyguide formed in the casin and intersecting the tumbler-guides, tumblers provided With transverse openings slidably mounted in the tumbler-guides and adapted to engage the recesses in the bolt,

one of said tumblers being shorter than the other and having the lower wall of its recess inclined toward the handle of the bolt, a tapering key fitting in the key-guide and having a shoulder at its enlarged end for engagement with the adjacent wall of the casing, said key being provided with a plurality of spaced lateral lugs increasing in size toward said shoulder and having terminal curved portions adapted to engage the transverse openings in the sliding tumblers for actuating the same when the key is tilted upon the 

